ok . there are a few things try from the manual if you have it . If not just type the model number on your computer and download it . Sorry i can't help other than that
I have lg oled55c9. on my tv you go to "Settings" then to "Connection" and then to "wifi connection " which will say "Not connected" Click on this with remote and in the top right you will see the toggle to turn on or off wifi . Hope this helps